Bicycle-brake.



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No. s98,|a|. Patented Apr. 22, 1902.

' A. DDN'EY.

BICYCLE-BRAKE. (Application md Nov. 4, 1901.) l (No Mogel.) 2shee'tksheet 2.

UNITED STATES 'PATENT FFICE.

ALFRED DONEY, OF PEN ARGYL, PENNSYLVANIA, ASSIGNOR OF ON E-THIRD TOLEONIDAS W. MORSS, OF SCRANTON, PENNSYLVANIA.

BICYCLE-BRAKE.

SPECIFICATION forming part of Letters Patent N o. 698,181, dated April22, 1902.

Application led November 4, 1901. Serial No. 81,136. (No model.)

To all whom t may concern.-

Be it known that I, ALFRED DoNEY, a citiful Bicycle-Brake, ofwhich thefollowing is` a specification.

My invention relates to certain improvements in bicycle-brakes of thatclass known as back-pedaling brakes, in which a movable conicalbraking-surface is moved into frictional contact with a similar surfacein the interior of the rear-wheel hub.

The object of the invention is to provide a brake of simple andeconomical construction in which an extensive braking-surface isafforded and one which has comparatively few operating parts, which maybe readily taken apart or assembled by an ordinary cyclist.

A further object is to provide for the taking up and adjustment of thefriction contactsurfaces as they wear away.

With these and other objects in view the invention consists in the novelconstruction and combination of parts hereinafter describe-d,illustrated I in the accompanying drawings, and particularly pointed outin the appended claims.

In the drawings, Figure 1 is a longitudinal sectional elevation of thehub of the rear or driving wheel of a bicycle provided with aback-pedaling brake arranged and construct- 'ed in accordance with myinvention. Fig. 2 is an end elevation of the same. Fig. 3 is a sectionalelevation of a portion of the brakeoperating mechanism on the line 3 3of Fig. l. Fig. 4 is a detail perspective view of a number of the moreimportant elements of the brake detached. Fig. 5 is a perspective viewof the axle of the rear driving-wheel.

Similar numerals of reference are employed vto designate correspondingparts throughout the several figures of the drawings.l

5 5 designate a portion of the rear forks of a bicycle-frame, to whichis securedlby suitable nuts 6 the threaded ends of the rear axle 7. Thisaxle for the greater portion of its length is square or polygonal incross-section and supports a conical friction-block 8, formed of fiberor some equivalent material and adapted for frictional braking-contactwith the tapering inner surface of the rear-wheel hub 8', but normallyheld out of contact therewith'by a coiled com pression-spring 9,extending between the smaller end of the brakeblock and a disk 10,secured to the threaded endv of the shaft and 'provided on its peripherywith' a ball-racefor the support of bearingballs 11. The oppositeportion of the ball-bearing isl formed in the end of the hub S', asillustrated in Fig. 1.

The larger end of the brake-block 8 is provided with a threaded oriiicefor the reception of a threaded collar 12, adapted to slide with thebrake-block upon the shaft and provided at its outer end with a doublecam-face 13. The collar 12 may be removed, together with` thebrake-block, from the squared portion of the shaft and adj usted to anydesired position within said block in order to provide for the taking upof the Wear of the frictionblock, and a lock-nut 15 may be provided tolock the parts in any adjusted position, althoughthis is not'necessarywhen the parts have been adjusted and are to be immediately replaced, asboth are provided with openings corresponding to the contour of theshaft 7 and are incapable of independent rotative movement when inposition on said shaft.v

. In order to iirmly lock the shaft against rotation, I employ a collar16, having a circular peripheral portion'and provided with a squaredorifice for the reception of the shaft. At ythe outer end of the collaris an annular flange 17, from which extends an arm 18,havinglocking-ears 19, arranged at its outer end andpadapted to engagethe opposite sides of one of the forks of the rear frame. On theperipheral portion of the collar 16 is mounted a revoluble collar20,.having at its inner end two cam-faces 21, adapted for operative con-4 tact with the mating cam-faces l13 on `the collar 12, and when thecollar 2O is revolved in a direction opposite to the normal direction oftravel of the rear-wheel hub these cam-faces will operate to move thebrake-block 8 in the direction of the spring 9, the periphery of theblock being brought into frictional contact with the inner surface ofthe hub and exerting a braking effect thereon.

In that end of the rear-wheel hub opposite IOO the bearing-disk 10 isscrewed or otherwise secured a ring 26, in which is formed a ballracefor the support of bearing-balls 27, the opposite half of the race beingformed on a ring or collar 28, secured to or formed integral with thecollar 20.

On the periphery of the ring 26 is mounted the rear sprocket-Wheel30,which may be connected by the usual link belt to the drivingsprocketon the crank-shaft of the machine. This sprocket-wheel is also supportedon the periphery of the collar 20, the inner face of the sprocket beingprovided with an annular groove 3l for the reception of the ring 2G, asshown more clearly in Figs. 1 and 3.

In the periphery of the ring 26 are formed a series of openings ornotches 32, the inner walls of which are inclined, and in said openingsare placed friction-rollers 33, which are normally held in position inthe narrowest portions of the openings by springs 34:,forming aratchet-clutch, which is in operation during the forward movement of thebicycle, as indicated by the arrow in Fig. 3, the clutch serving tocouple the sprocket-wheel to the rear-wheel hub and to rotate the latterfor traveling the bicycle.

In the periphery of the collar 2O are formed openings or notches 42,having inner inclined walls, and in said openings are rollers 43,normally held in clutching position by springs 4A. During the forwardtravel of the bicycle the clutching mechanism between the collar 2O andthe inner surface ofthe sprocket-wheel is inoperative.

Then the rider stops pedaling, the chain and sprocket-wheel will stop,but the hub will continue to rotate freely, permitting the rider tocoast. lVhen it is desired to apply the brake, the pedals are turnedslightly in a reverse direction, causing the immediate engagement of theclutching mechanism between the sprocket-wheel and the collar 20.

This movement causes the cams 2l and 13 to coact, producing alongitudinal movement of the brake-block in the direction of the spring9 and bringing the periphery of the block into contact with the innersurface of the hub. The friction exerted is at all times absolutelyunder the control of the rider and may be applied very gradually, ifdesired, in order to slowly stop the machine.

It will be noted that when the brake-block is in contact with thefriction-surface of the hub the smaller end of the block will extend ashort distance beyond the hub-surface, the wear of the parts being suchthat the block can always be adj usted to a new position without comingin contact with any ridges or rings formed on either surface. Thisconstruction is illustrated in Fig. l, the brake-block being shown ininoperative position, with its smaller end directly in alinement withthe smallest diameter of the hub friction-surface. It is apparent thatthe slightest endwise movement of the brake-block under the iniiuence ofthe cams will cause the smaller `end of the block to travel beyond thesmallest diameter of the hub, so that those surfaces of the block andhub which are in frictional contact during the braking operation willnot be subjected to any uneven wear, such as might tend to cause theformation of ribs or ridges and prevent proper action of the brake whenit becomes necessary to adjust the brake-block to take up for wear.

Although the structure as herein illustrated and described presents thepreferred form of the device, it is obvious that many changes in theform, proportions, size, and minor details of construction may be madewithin the scope of the claims without departing from the spirit orsacrificing any of the advantages of myinvention.

Having thus described my invention, what I claim is l. The combinationin a back pedaling brake, of a rear-wheel hub having an internalbraking-surface, a fixed polygonal shaft, a non-rotatable brake-blockmounted on said shaft, means for adjusting said brake-blocklongitudinally of the shaft, a cam-faced collarfor moving saidbrake-block into operative position, a sprocket-wheel, and twoconcentrically-disposed clutching devices arranged in the same verticalplane, said clutches being interposed respectively between the camfacedcollar and the sprocket-wheel and between the rear-Wheel hub and thesprocketwheel, and adapted for operation in opposite direction.

2. The combination in a back pedaling brake, of the hub having an innerbrakingsurface, a polygonal shaft rigidly secured to the frame of themachine, a non-rotatable brake-block mounted for longitudinal movementthereon, a collar adjustably secured in one end of the block and havingan end cam, a second cam-faced collar adapted to coact therewith andhaving a clutch-face, a clutchrin g arranged concentrically With saidsecond collar and carried by the hub, and a sprocketwheel adapted to beengaged by one of said clutch-faces when traveling in a forwarddirection, and by the other of said clutch-faces when traveling in areverse direction, said clutch-faces and the sprocket-Wheel teeth beingarranged in the same vertical plane, substantially as specified.

3. The combination in a back-pedaling brake,of a rear-wheel hub havingan abruptlyterminating internal friction-surface,alongitudinally-movable brake-block adapted to engage saidfriction-surface, the smaller end of said brake-block being extendedslightly beyond the smaller end of the hub friction-surface when thefriction-surfaces of the brakeblock and hub are in contact, thereby toavoid uneven wear, a rigid shaft carrying said brake-block, and meansfor effecting a longitudinal movement of said brake-block, substantiallyas specified.

et. The combination in a back-pedaling brake, of the rear-wheel hubhaving an inner ICO IIO

n of the frame of themachine, a brake-block mounted on the shaft andlongitudinally movable thereon, a cam-faced collar adj ustably securedto said brake-block, a second carnfaced collar revoluble on theshaft-locking collar and provided with a peripheral clutchface, aring'secured to or formed integral with the hub and also havingaperipheral clutchface, and a sprocket-Wheel having an annular groove inits inner face for the reception of said ring, said sprocket-wheel beingadapted to engage with either of said clutch-faces,

substantially as specified.,

5. The combination in a bck-pedaling brake,of the hub having an innerbraking-surface, a shaft, a non-rotatable brake-blocklongitudiuallymovable thereon, a shaft-locking collar having anouter Hangs, an armsecured to the collar and engaging a iiXed portion of the frame of themachine, a cam-faced collar mountedon said locking-collar and providedwith a peripheral clutch -,face, a ring carried by the hub and-alsohaving a peripheral clutch-face, a sprocket-wheel having an annulargroove forthe reception of said ring and confined in position bythefiange of the locking-collar, said sprocket- Wheel being adapted toengage with one of such clutch-faces when traveling in a forwarddirection,- and with the opposite clutch-face when traveling in reversedirection, substantially as specified.

6. The combination in a back-pedaling brake, of a shaft of square orpolygonalform in cross-section, a disk secured to saidV shaft 4o pandhaving a peripheral ball-race, a hub also having a ball-race,bearing-balls for the support ofthe hub, the inner face of said hubbeing provided with a braking-surface, a brakeblock longitudinallymovable on the shaft, a compression#spring'normally holding saidbrake-block in inoperative position, a camfaced collar adj ustably,secured in the larger end of the brake-block, a shaft-locking collarhaving a circular periphery and'prov'ided With 5o an enlarged annularend Bange, an arm pro` jecting laterally from the flange and'having,ears for securing the same toa fixed portion of the bicycle-frame, a cam#faced collar mounted on the shaft-lockingcollar and adapted to coactwith the cam-collar of thebrakeA block, there being on the periphery ofsaid second cam-faced collar, a clutching-face, a bearing-ring securedto or formed integral with the hub, a ball-bearing disposed between 6o lsaid ring and the second earn-faced collar,

the peripheral surface of said ring being-provided With aclutching-face, and asprocket#` wheel having in its inner `face anannular groove for the reception of Ysaidjring, :and confined inposition by the enlarged annular iiange of the shaft-lockingcollar,'substan-v tially as specified.` i f In testimony that yIclaimthe yforegoingas 'i i, my own I have hereto afxedmy signature in 47c i the presence of` two witnesses; f

, Witnesses: V p W. R. GRUBB,

JOHN W. 'JoNnsg

